Kernel/arch/armv7/mm_virt.c

   1 /*
   2  * Acess2
   3  *
   4  * ARM7 Virtual Memory Manager
   5  * - arch/arm7/mm_virt.c
   6  */
   7 #define DEBUG   0
   8 #include <acess.h>
   9 #include <mm_virt.h>
  10 #include <hal_proc.h>
  11
  12 #define TRACE_MAPS      0
  13
  14 #define AP_KRW_ONLY     1       // Kernel page
  15 #define AP_KRO_ONLY     5       // Kernel RO page
  16 #define AP_RW_BOTH      3       // Standard RW
  17 #define AP_RO_BOTH      7       // COW Page
  18 #define AP_RO_USER      2       // User RO Page
  19 #define PADDR_MASK_LVL1 0xFFFFFC00
  20
  21 // === IMPORTS ===
  22 extern Uint32   kernel_table0[];
  23
  24 // === TYPES ===
  25 typedef struct
  26 {
  27         tPAddr  PhysAddr;
  28         Uint8   Size;
  29         Uint8   Domain;
  30         BOOL    bExecutable;
  31         BOOL    bGlobal;
  32         BOOL    bShared;
  33          int    AP;
  34 } tMM_PageInfo;
  35
  36 //#define FRACTAL(table1, addr) ((table1)[ (0xFF8/4*1024) + ((addr)>>20)])
  37 #define FRACTAL(table1, addr)   ((table1)[ (0xFF8/4*1024) + ((addr)>>22)])
  38 #define USRFRACTAL(addr)        (*((Uint32*)(0x7FDFF000) + ((addr)>>22)))
  39 #define TLBIALL()       __asm__ __volatile__ ("mcr p15, 0, %0, c8, c7, 0" : : "r" (0))
  40 #define TLBIMVA(addr)   __asm__ __volatile__ ("mcr p15, 0, %0, c8, c7, 1;dsb;isb" : : "r" ((addr)&~0xFFF):"memory")
  41 #define DCCMVAC(addr)   __asm__ __volatile__ ("mcr p15, 0, %0, c7, c10, 1" : : "r" ((addr)&~0xFFF))
  42
  43 // === PROTOTYPES ===
  44 void    MM_int_GetTables(tVAddr VAddr, Uint32 **Table0, Uint32 **Table1);
  45  int    MM_int_AllocateCoarse(tVAddr VAddr, int Domain);
  46  int    MM_int_SetPageInfo(tVAddr VAddr, tMM_PageInfo *pi);
  47  int    MM_int_GetPageInfo(tVAddr VAddr, tMM_PageInfo *pi);
  48 tVAddr  MM_NewUserStack(void);
  49 tPAddr  MM_AllocateZero(tVAddr VAddr);
  50 tPAddr  MM_AllocateRootTable(void);
  51 void    MM_int_CloneTable(Uint32 *DestEnt, int Table);
  52 tPAddr  MM_Clone(void);
  53 tVAddr  MM_NewKStack(int bGlobal);
  54 void    MM_int_DumpTableEnt(tVAddr Start, size_t Len, tMM_PageInfo *Info);
  55 //void  MM_DumpTables(tVAddr Start, tVAddr End);
  56 void    MM_PageFault(Uint32 PC, Uint32 Addr, Uint32 DFSR, int bPrefetch);
  57
  58 // === GLOBALS ===
  59 tPAddr  giMM_ZeroPage;
  60
  61 // === CODE ===
  62 int MM_InitialiseVirtual(void)
  63 {
  64         return 0;
  65 }
  66
  67 void MM_int_GetTables(tVAddr VAddr, Uint32 **Table0, Uint32 **Table1)
  68 {
  69         if(VAddr & 0x80000000) {
  70                 *Table0 = (void*)&kernel_table0;        // Level 0
  71                 *Table1 = (void*)MM_TABLE1KERN; // Level 1
  72         }
  73         else {
  74                 *Table0 = (void*)MM_TABLE0USER;
  75                 *Table1 = (void*)MM_TABLE1USER;
  76         }
  77 }
  78
  79 int MM_int_AllocateCoarse(tVAddr VAddr, int Domain)
  80 {
  81         Uint32  *table0, *table1;
  82         Uint32  *desc;
  83         tPAddr  paddr;
  84
  85         ENTER("xVAddr iDomain", VAddr, Domain);
  86
  87         MM_int_GetTables(VAddr, &table0, &table1);
  88
  89         VAddr &= ~(0x400000-1); // 4MiB per "block", 1 Page
  90
  91         desc = &table0[ VAddr>>20];
  92         LOG("desc = %p", desc);
  93
  94         // table0: 4 bytes = 1 MiB
  95
  96         LOG("desc[0] = %x", desc[0]);
  97         LOG("desc[1] = %x", desc[1]);
  98         LOG("desc[2] = %x", desc[2]);
  99         LOG("desc[3] = %x", desc[3]);
 100
 101         if( (desc[0] & 3) != 0 || (desc[1] & 3) != 0
 102          || (desc[2] & 3) != 0 || (desc[3] & 3) != 0 )
 103         {
 104                 // Error?
 105                 LEAVE('i', 1);
 106                 return 1;
 107         }
 108
 109         paddr = MM_AllocPhys();
 110         if( !paddr )
 111         {
 112                 // Error
 113                 LEAVE('i', 2);
 114                 return 2;
 115         }
 116
 117         *desc = paddr | (Domain << 5) | 1;
 118         desc[1] = desc[0] + 0x400;
 119         desc[2] = desc[0] + 0x800;
 120         desc[3] = desc[0] + 0xC00;
 121
 122         if( VAddr < 0x80000000 ) {
 123                 USRFRACTAL(VAddr) = paddr | 0x13;
 124         }
 125         else {
 126                 FRACTAL(table1, VAddr) = paddr | 0x13;
 127         }
 128
 129         // TLBIALL
 130         TLBIALL();
 131
 132         memset( (void*)&table1[ (VAddr >> 12) & ~(1024-1) ], 0, 0x1000 );
 133
 134         LEAVE('i', 0);
 135         return 0;
 136 }
 137
 138 int MM_int_SetPageInfo(tVAddr VAddr, tMM_PageInfo *pi)
 139 {
 140         Uint32  *table0, *table1;
 141         Uint32  *desc;
 142
 143         ENTER("pVAddr ppi", VAddr, pi);
 144
 145         MM_int_GetTables(VAddr, &table0, &table1);
 146
 147         desc = &table0[ VAddr >> 20 ];
 148         LOG("desc = %p", desc);
 149
 150         switch(pi->Size)
 151         {
 152         case 12:        // Small Page
 153         case 16:        // Large Page
 154                 LOG("Page");
 155                 if( (*desc & 3) == 0 ) {
 156                         MM_int_AllocateCoarse( VAddr, pi->Domain );
 157                 }
 158                 desc = &table1[ VAddr >> 12 ];
 159                 LOG("desc (2) = %p", desc);
 160                 if( pi->Size == 12 )
 161                 {
 162                         // Small page
 163                         // - Error if overwriting a large page
 164                         if( (*desc & 3) == 1 )  LEAVE_RET('i', 1);
 165                         if( pi->PhysAddr == 0 ) {
 166                                 *desc = 0;
 167                                 TLBIMVA( VAddr );
 168                                 DCCMVAC( (tVAddr) desc );
 169                                 TLBIALL();
 170                                 LEAVE('i', 0);
 171                                 return 0;
 172                         }
 173
 174                         *desc = (pi->PhysAddr & 0xFFFFF000) | 2;
 175                         if(!pi->bExecutable)    *desc |= 1;     // XN
 176                         if(!pi->bGlobal)        *desc |= 1 << 11;       // nG
 177                         if( pi->bShared)        *desc |= 1 << 10;       // S
 178                         *desc |= (pi->AP & 3) << 4;     // AP
 179                         *desc |= ((pi->AP >> 2) & 1) << 9;      // APX
 180                         TLBIMVA( VAddr );
 181                         TLBIALL();
 182                         DCCMVAC( (tVAddr) desc );
 183                         LEAVE('i', 0);
 184                         return 0;
 185                 }
 186                 else
 187                 {
 188                         // Large page
 189                         Log_Warning("MMVirt", "TODO: Implement large pages in MM_int_SetPageInfo");
 190                 }
 191                 break;
 192         case 20:        // Section or unmapped
 193                 Log_Warning("MMVirt", "TODO: Implement sections in MM_int_SetPageInfo");
 194                 break;
 195         case 24:        // Supersection
 196                 // Error if not aligned
 197                 if( VAddr & 0xFFFFFF ) {
 198                         LEAVE('i', 1);
 199                         return 1;
 200                 }
 201                 if( (*desc & 3) == 0 || ((*desc & 3) == 2 && (*desc & (1 << 18)))  )
 202                 {
 203                         if( pi->PhysAddr == 0 ) {
 204                                 *desc = 0;
 205                         }
 206                         else {
 207                                 // Apply
 208                                 *desc = pi->PhysAddr & 0xFF000000;
 209 //                              *desc |= ((pi->PhysAddr >> 32) & 0xF) << 20;
 210 //                              *desc |= ((pi->PhysAddr >> 36) & 0x7) << 5;
 211                                 *desc |= 2 | (1 << 18);
 212                         }
 213                         // TODO: Apply to all entries
 214                         Log_Warning("MMVirt", "TODO: Apply changes to all entries of supersections");
 215                         LEAVE('i', 0);
 216                         return 0;
 217                 }
 218                 // TODO: What here?
 219                 Log_Warning("MMVirt", "TODO: 24-bit not on supersection?");
 220                 LEAVE('i', 1);
 221                 return 1;
 222         }
 223
 224         LEAVE('i', 1);
 225         return 1;
 226 }
 227
 228 int MM_int_GetPageInfo(tVAddr VAddr, tMM_PageInfo *pi)
 229 {
 230         Uint32  *table0, *table1;
 231         Uint32  desc;
 232
 233 //      LogF("MM_int_GetPageInfo: VAddr=%p, pi=%p\n", VAddr, pi);
 234
 235         MM_int_GetTables(VAddr, &table0, &table1);
 236
 237         desc = table0[ VAddr >> 20 ];
 238
 239 //      if( VAddr > 0x90000000)
 240 //              LOG("table0 desc(%p) = %x", &table0[ VAddr >> 20 ], desc);
 241
 242         pi->bExecutable = 1;
 243         pi->bGlobal = 0;
 244         pi->bShared = 0;
 245         pi->AP = 0;
 246
 247         switch( (desc & 3) )
 248         {
 249         // 0: Unmapped
 250         case 0:
 251                 pi->PhysAddr = 0;
 252                 pi->Size = 20;
 253                 pi->Domain = 0;
 254                 return 1;
 255
 256         // 1: Coarse page table
 257         case 1:
 258                 // Domain from top level table
 259                 pi->Domain = (desc >> 5) & 7;
 260                 // Get next level
 261                 desc = table1[ VAddr >> 12 ];
 262 //              LOG("table1 desc(%p) = %x", &table1[ VAddr >> 12 ], desc);
 263                 switch( desc & 3 )
 264                 {
 265                 // 0: Unmapped
 266                 case 0:
 267                         pi->Size = 12;
 268                         return 1;
 269                 // 1: Large Page (64KiB)
 270                 case 1:
 271                         pi->Size = 16;
 272                         pi->PhysAddr = desc & 0xFFFF0000;
 273                         pi->AP = ((desc >> 4) & 3) | (((desc >> 9) & 1) << 2);
 274                         pi->bExecutable = !(desc & 0x8000);
 275                         pi->bShared = (desc >> 10) & 1;
 276                         return 0;
 277                 // 2/3: Small page
 278                 case 2:
 279                 case 3:
 280                         pi->Size = 12;
 281                         pi->PhysAddr = desc & 0xFFFFF000;
 282                         pi->bExecutable = !(desc & 1);
 283                         pi->bGlobal = !(desc >> 11);
 284                         pi->bShared = (desc >> 10) & 1;
 285                         pi->AP = ((desc >> 4) & 3) | (((desc >> 9) & 1) << 2);
 286                         return 0;
 287                 }
 288                 return 1;
 289
 290         // 2: Section (or Supersection)
 291         case 2:
 292                 if( desc & (1 << 18) ) {
 293                         // Supersection
 294                         pi->PhysAddr = desc & 0xFF000000;
 295                         pi->PhysAddr |= (Uint64)((desc >> 20) & 0xF) << 32;
 296                         pi->PhysAddr |= (Uint64)((desc >> 5) & 0x7) << 36;
 297                         pi->Size = 24;
 298                         pi->Domain = 0; // Supersections default to zero
 299                         pi->AP = ((desc >> 10) & 3) | (((desc >> 15) & 1) << 2);
 300                         return 0;
 301                 }
 302
 303                 // Section
 304                 pi->PhysAddr = desc & 0xFFF80000;
 305                 pi->Size = 20;
 306                 pi->Domain = (desc >> 5) & 7;
 307                 pi->AP = ((desc >> 10) & 3) | (((desc >> 15) & 1) << 2);
 308                 return 0;
 309
 310         // 3: Reserved (invalid)
 311         case 3:
 312                 pi->PhysAddr = 0;
 313                 pi->Size = 20;
 314                 pi->Domain = 0;
 315                 return 2;
 316         }
 317         return 2;
 318 }
 319
 320 // --- Exports ---
 321 tPAddr MM_GetPhysAddr(tVAddr VAddr)
 322 {
 323         tMM_PageInfo    pi;
 324         if( MM_int_GetPageInfo(VAddr, &pi) )
 325                 return 0;
 326         return pi.PhysAddr | (VAddr & ((1 << pi.Size)-1));
 327 }
 328
 329 Uint MM_GetFlags(tVAddr VAddr)
 330 {
 331         tMM_PageInfo    pi;
 332          int    ret;
 333
 334         if( MM_int_GetPageInfo(VAddr, &pi) )
 335                 return 0;
 336
 337         ret = 0;
 338
 339         switch(pi.AP)
 340         {
 341         case 0:
 342                 break;
 343         case AP_KRW_ONLY:
 344                 ret |= MM_PFLAG_KERNEL;
 345                 break;
 346         case AP_KRO_ONLY:
 347                 ret |= MM_PFLAG_KERNEL|MM_PFLAG_RO;
 348                 break;
 349         case AP_RW_BOTH:
 350                 break;
 351         case AP_RO_BOTH:
 352                 ret |= MM_PFLAG_COW;
 353                 break;
 354         case AP_RO_USER:
 355                 ret |= MM_PFLAG_RO;
 356                 break;
 357         }
 358
 359         if( pi.bExecutable )    ret |= MM_PFLAG_EXEC;
 360         return ret;
 361 }
 362
 363 void MM_SetFlags(tVAddr VAddr, Uint Flags, Uint Mask)
 364 {
 365         tMM_PageInfo    pi;
 366         Uint    curFlags;
 367
 368         if( MM_int_GetPageInfo(VAddr, &pi) )
 369                 return ;
 370
 371         curFlags = MM_GetFlags(VAddr);
 372         if( (curFlags & Mask) == Flags )
 373                 return ;
 374         curFlags &= ~Mask;
 375         curFlags |= Flags;
 376
 377         if( curFlags & MM_PFLAG_COW )
 378                 pi.AP = AP_RO_BOTH;
 379         else
 380         {
 381                 switch(curFlags & (MM_PFLAG_KERNEL|MM_PFLAG_RO) )
 382                 {
 383                 case 0:
 384                         pi.AP = AP_RW_BOTH;     break;
 385                 case MM_PFLAG_KERNEL:
 386                         pi.AP = AP_KRW_ONLY;    break;
 387                 case MM_PFLAG_RO:
 388                         pi.AP = AP_RO_USER;     break;
 389                 case MM_PFLAG_KERNEL|MM_PFLAG_RO:
 390                         pi.AP = AP_KRO_ONLY;    break;
 391                 }
 392         }
 393
 394         pi.bExecutable = !!(curFlags & MM_PFLAG_EXEC);
 395
 396         MM_int_SetPageInfo(VAddr, &pi);
 397 }
 398
 399 int MM_IsValidBuffer(tVAddr Addr, size_t Size)
 400 {
 401         tMM_PageInfo    pi;
 402          int    bUser = 0;
 403
 404         Size += Addr & (PAGE_SIZE-1);
 405         Addr &= ~(PAGE_SIZE-1);
 406
 407         if( MM_int_GetPageInfo(Addr, &pi) )     return 0;
 408         Addr += PAGE_SIZE;
 409
 410         if(pi.AP != AP_KRW_ONLY && pi.AP != AP_KRO_ONLY)
 411                 bUser = 1;
 412
 413         while( Size >= PAGE_SIZE )
 414         {
 415                 if( MM_int_GetPageInfo(Addr, &pi) )
 416                         return 0;
 417                 if(bUser && (pi.AP == AP_KRW_ONLY || pi.AP == AP_KRO_ONLY))
 418                         return 0;
 419                 Addr += PAGE_SIZE;
 420                 Size -= PAGE_SIZE;
 421         }
 422
 423         return 1;
 424 }
 425
 426 int MM_Map(tVAddr VAddr, tPAddr PAddr)
 427 {
 428         tMM_PageInfo    pi = {0};
 429         #if TRACE_MAPS
 430         Log("MM_Map %P=>%p", PAddr, VAddr);
 431         #endif
 432
 433         pi.PhysAddr = PAddr;
 434         pi.Size = 12;
 435         if(VAddr < USER_STACK_TOP)
 436                 pi.AP = AP_RW_BOTH;
 437         else
 438                 pi.AP = AP_KRW_ONLY;    // Kernel Read/Write
 439         pi.bExecutable = 1;
 440         if( MM_int_SetPageInfo(VAddr, &pi) ) {
 441 //              MM_DerefPhys(pi.PhysAddr);
 442                 return 0;
 443         }
 444         return pi.PhysAddr;
 445 }
 446
 447 tPAddr MM_Allocate(tVAddr VAddr)
 448 {
 449         tMM_PageInfo    pi = {0};
 450
 451         ENTER("pVAddr", VAddr);
 452
 453         pi.PhysAddr = MM_AllocPhys();
 454         if( pi.PhysAddr == 0 )  LEAVE_RET('i', 0);
 455         pi.Size = 12;
 456         if(VAddr < USER_STACK_TOP)
 457                 pi.AP = AP_RW_BOTH;
 458         else
 459                 pi.AP = AP_KRW_ONLY;
 460         pi.bExecutable = 0;
 461         if( MM_int_SetPageInfo(VAddr, &pi) ) {
 462                 MM_DerefPhys(pi.PhysAddr);
 463                 LEAVE('i', 0);
 464                 return 0;
 465         }
 466         LEAVE('x', pi.PhysAddr);
 467         return pi.PhysAddr;
 468 }
 469
 470 tPAddr MM_AllocateZero(tVAddr VAddr)
 471 {
 472         if( !giMM_ZeroPage ) {
 473                 giMM_ZeroPage = MM_Allocate(VAddr);
 474                 MM_RefPhys(giMM_ZeroPage);
 475                 memset((void*)VAddr, 0, PAGE_SIZE);
 476         }
 477         else {
 478                 MM_RefPhys(giMM_ZeroPage);
 479                 MM_Map(VAddr, giMM_ZeroPage);
 480         }
 481         MM_SetFlags(VAddr, MM_PFLAG_COW, MM_PFLAG_COW);
 482         return giMM_ZeroPage;
 483 }
 484
 485 void MM_Deallocate(tVAddr VAddr)
 486 {
 487         tMM_PageInfo    pi;
 488
 489         if( MM_int_GetPageInfo(VAddr, &pi) )    return ;
 490         if( pi.PhysAddr == 0 )  return;
 491         MM_DerefPhys(pi.PhysAddr);
 492
 493         pi.PhysAddr = 0;
 494         pi.AP = 0;
 495         pi.bExecutable = 0;
 496         MM_int_SetPageInfo(VAddr, &pi);
 497 }
 498
 499 tPAddr MM_AllocateRootTable(void)
 500 {
 501         tPAddr  ret;
 502
 503         ret = MM_AllocPhysRange(2, -1);
 504         if( ret & 0x1000 ) {
 505                 MM_DerefPhys(ret);
 506                 MM_DerefPhys(ret+0x1000);
 507                 ret = MM_AllocPhysRange(3, -1);
 508                 if( ret & 0x1000 ) {
 509                         MM_DerefPhys(ret);
 510                         ret += 0x1000;
 511 //                      Log("MM_AllocateRootTable: Second try not aligned, %P", ret);
 512                 }
 513                 else {
 514                         MM_DerefPhys(ret + 0x2000);
 515 //                      Log("MM_AllocateRootTable: Second try aligned, %P", ret);
 516                 }
 517         }
 518 //      else
 519 //              Log("MM_AllocateRootTable: Got it in one, %P", ret);
 520         return ret;
 521 }
 522
 523 void MM_int_CloneTable(Uint32 *DestEnt, int Table)
 524 {
 525         tPAddr  table;
 526         Uint32  *tmp_map;
 527         Uint32  *cur = (void*)MM_TABLE1USER;
 528 //      Uint32  *cur = &FRACTAL(MM_TABLE1USER,0);
 529          int    i;
 530
 531         table = MM_AllocPhys();
 532         if(!table)      return ;
 533
 534         cur += 256*Table;
 535
 536         tmp_map = (void*)MM_MapTemp(table);
 537
 538         for( i = 0; i < 1024; i ++ )
 539         {
 540 //              Log_Debug("MMVirt", "cur[%i] (%p) = %x", Table*256+i, &cur[Table*256+i], cur[Table*256+i]);
 541                 switch(cur[i] & 3)
 542                 {
 543                 case 0: tmp_map[i] = 0; break;
 544                 case 1:
 545                         tmp_map[i] = 0;
 546                         Log_Error("MMVirt", "TODO: Support large pages in MM_int_CloneTable (%p)", (Table*256+i)*0x1000);
 547                         // Large page?
 548                         break;
 549                 case 2:
 550                 case 3:
 551                         // Small page
 552                         // - If full RW
 553 //                      Debug("%p cur[%i] & 0x230 = 0x%x", Table*256*0x1000, i, cur[i] & 0x230);
 554                         if( (cur[i] & 0x230) == 0x010 )
 555                         {
 556                                 void    *dst, *src;
 557                                 tPAddr  newpage;
 558                                 newpage = MM_AllocPhys();
 559                                 src = (void*)( (Table*256+i)*0x1000 );
 560                                 dst = (void*)MM_MapTemp(newpage);
 561 //                              Debug("Taking a copy of kernel page %p (%P)", src, cur[i] & ~0xFFF);
 562                                 memcpy(dst, src, PAGE_SIZE);
 563                                 MM_FreeTemp( (tVAddr)dst );
 564                                 tmp_map[i] = newpage | (cur[i] & 0xFFF);
 565                         }
 566                         else
 567                         {
 568                                 if( (cur[i] & 0x230) == 0x030 )
 569                                         cur[i] |= 0x200;        // Set to full RO (Full RO=COW, User RO = RO)
 570                                 tmp_map[i] = cur[i];
 571                                 MM_RefPhys( tmp_map[i] & ~0xFFF );
 572                         }
 573                         break;
 574                 }
 575         }
 576         MM_FreeTemp( (tVAddr) tmp_map );
 577
 578         DestEnt[0] = table + 0*0x400 + 1;
 579         DestEnt[1] = table + 1*0x400 + 1;
 580         DestEnt[2] = table + 2*0x400 + 1;
 581         DestEnt[3] = table + 3*0x400 + 1;
 582 }
 583
 584 tPAddr MM_Clone(void)
 585 {
 586         tPAddr  ret;
 587         Uint32  *new_lvl1_1, *new_lvl1_2, *cur;
 588         Uint32  *tmp_map;
 589          int    i;
 590
 591 //      MM_DumpTables(0, KERNEL_BASE);
 592
 593         ret = MM_AllocateRootTable();
 594
 595         cur = (void*)MM_TABLE0USER;
 596         new_lvl1_1 = (void*)MM_MapTemp(ret);
 597         new_lvl1_2 = (void*)MM_MapTemp(ret+0x1000);
 598         tmp_map = new_lvl1_1;
 599         for( i = 0; i < 0x800-4; i ++ )
 600         {
 601                 // HACK! Ignore the original identity mapping
 602                 if( i == 0 && Threads_GetTID() == 0 ) {
 603                         tmp_map[0] = 0;
 604                         continue;
 605                 }
 606                 if( i == 0x400 )
 607                         tmp_map = &new_lvl1_2[-0x400];
 608                 switch( cur[i] & 3 )
 609                 {
 610                 case 0: tmp_map[i] = 0; break;
 611                 case 1:
 612                         MM_int_CloneTable(&tmp_map[i], i);
 613                         i += 3; // Tables are alocated in blocks of 4
 614                         break;
 615                 case 2:
 616                 case 3:
 617                         Log_Error("MMVirt", "TODO: Support Sections/Supersections in MM_Clone (i=%i)", i);
 618                         tmp_map[i] = 0;
 619                         break;
 620                 }
 621         }
 622
 623         // Allocate Fractal table
 624         {
 625                  int    j, num;
 626                 tPAddr  tmp = MM_AllocPhys();
 627                 Uint32  *table = (void*)MM_MapTemp(tmp);
 628                 Uint32  sp;
 629                 register Uint32 __SP asm("sp");
 630
 631                 // Map table to last 4MiB of user space
 632                 new_lvl1_2[0x3FC] = tmp + 0*0x400 + 1;
 633                 new_lvl1_2[0x3FD] = tmp + 1*0x400 + 1;
 634                 new_lvl1_2[0x3FE] = tmp + 2*0x400 + 1;
 635                 new_lvl1_2[0x3FF] = tmp + 3*0x400 + 1;
 636
 637                 tmp_map = new_lvl1_1;
 638                 for( j = 0; j < 512; j ++ )
 639                 {
 640                         if( j == 256 )
 641                                 tmp_map = &new_lvl1_2[-0x400];
 642                         if( (tmp_map[j*4] & 3) == 1 )
 643                         {
 644                                 table[j] = tmp_map[j*4] & PADDR_MASK_LVL1;// 0xFFFFFC00;
 645                                 table[j] |= 0x813;      // nG, Kernel Only, Small page, XN
 646                         }
 647                         else
 648                                 table[j] = 0;
 649                 }
 650                 // Fractal
 651                 table[j++] = (ret + 0x0000) | 0x813;
 652                 table[j++] = (ret + 0x1000) | 0x813;
 653                 // Nuke the rest
 654                 for(      ; j < 1024; j ++ )
 655                         table[j] = 0;
 656
 657                 // Get kernel stack bottom
 658                 sp = __SP & ~(MM_KSTACK_SIZE-1);
 659                 j = (sp / 0x1000) % 1024;
 660                 num = MM_KSTACK_SIZE/0x1000;
 661
 662 //              Log("num = %i, sp = %p, j = %i", num, sp, j);
 663
 664                 // Copy stack pages
 665                 for(; num--; j ++, sp += 0x1000)
 666                 {
 667                         tVAddr  page;
 668                         void    *tmp_page;
 669
 670                         page = MM_AllocPhys();
 671 //                      Log("page = %P", page);
 672                         table[j] = page | 0x813;
 673
 674                         tmp_page = (void*)MM_MapTemp(page);
 675                         memcpy(tmp_page, (void*)sp, 0x1000);
 676                         MM_FreeTemp( (tVAddr) tmp_page );
 677                 }
 678
 679                 MM_FreeTemp( (tVAddr)table );
 680         }
 681
 682         MM_FreeTemp( (tVAddr)new_lvl1_1 );
 683         MM_FreeTemp( (tVAddr)new_lvl1_2 );
 684
 685 //      Log("MM_Clone: ret = %P", ret);
 686
 687         return ret;
 688 }
 689
 690 void MM_ClearUser(void)
 691 {
 692          int    i, j;
 693         const int       user_table_count = USER_STACK_TOP / (256*0x1000);
 694         Uint32  *cur = (void*)MM_TABLE0USER;
 695         Uint32  *tab;
 696
 697 //      MM_DumpTables(0, 0x80000000);
 698
 699 //      Log("user_table_count = %i (as opposed to %i)", user_table_count, 0x800-4);
 700
 701         for( i = 0; i < user_table_count; i ++ )
 702         {
 703                 switch( cur[i] & 3 )
 704                 {
 705                 case 0: break;  // Already unmapped
 706                 case 1: // Sub pages
 707                         tab = (void*)(MM_TABLE1USER + i*256*sizeof(Uint32));
 708                         for( j = 0; j < 1024; j ++ )
 709                         {
 710                                 switch( tab[j] & 3 )
 711                                 {
 712                                 case 0: break;  // Unmapped
 713                                 case 1:
 714                                         Log_Error("MMVirt", "TODO: Support large pages in MM_ClearUser");
 715                                         break;
 716                                 case 2:
 717                                 case 3:
 718                                         MM_DerefPhys( tab[j] & ~(PAGE_SIZE-1) );
 719                                         break;
 720                                 }
 721                         }
 722                         MM_DerefPhys( cur[i] & ~(PAGE_SIZE-1) );
 723                         cur[i+0] = 0;
 724                         cur[i+1] = 0;
 725                         cur[i+2] = 0;
 726                         i += 3;
 727                         break;
 728                 case 2:
 729                 case 3:
 730                         Log_Error("MMVirt", "TODO: Implement sections/supersections in MM_ClearUser");
 731                         break;
 732                 }
 733                 cur[i] = 0;
 734         }
 735
 736         // Final block of 4 tables are KStack
 737         i = 0x800 - 4;
 738
 739         // Clear out unused stacks
 740         {
 741                 register Uint32 __SP asm("sp");
 742                  int    cur_stack_base = ((__SP & ~(MM_KSTACK_SIZE-1)) / PAGE_SIZE) % 1024;
 743
 744                 tab = (void*)(MM_TABLE1USER + i*256*sizeof(Uint32));
 745
 746                 // First 512 is the Table1 mapping + 2 for Table0 mapping
 747                 for( j = 512+2; j < 1024; j ++ )
 748                 {
 749                         // Skip current stack
 750                         if( j == cur_stack_base ) {
 751                                 j += (MM_KSTACK_SIZE / PAGE_SIZE) - 1;
 752                                 continue ;
 753                         }
 754                         if( !(tab[j] & 3) )     continue;
 755                         ASSERT( (tab[j] & 3) == 2 );
 756                         MM_DerefPhys( tab[j] & ~(PAGE_SIZE) );
 757                         tab[j] = 0;
 758                 }
 759         }
 760
 761
 762 //      MM_DumpTables(0, 0x80000000);
 763 }
 764
 765 tVAddr MM_MapTemp(tPAddr PAddr)
 766 {
 767         tVAddr  ret;
 768         tMM_PageInfo    pi;
 769
 770         for( ret = MM_TMPMAP_BASE; ret < MM_TMPMAP_END - PAGE_SIZE; ret += PAGE_SIZE )
 771         {
 772                 if( MM_int_GetPageInfo(ret, &pi) == 0 )
 773                         continue;
 774
 775 //              Log("MapTemp %P at %p by %p", PAddr, ret, __builtin_return_address(0));
 776                 MM_RefPhys(PAddr);      // Counter the MM_Deallocate in FreeTemp
 777                 MM_Map(ret, PAddr);
 778
 779                 return ret;
 780         }
 781         Log_Warning("MMVirt", "MM_MapTemp: All slots taken");
 782         return 0;
 783 }
 784
 785 void MM_FreeTemp(tVAddr VAddr)
 786 {
 787         if( VAddr < MM_TMPMAP_BASE || VAddr >= MM_TMPMAP_END ) {
 788                 Log_Warning("MMVirt", "MM_FreeTemp: Passed an addr not from MM_MapTemp (%p)", VAddr);
 789                 return ;
 790         }
 791
 792         MM_Deallocate(VAddr);
 793 }
 794
 795 tVAddr MM_MapHWPages(tPAddr PAddr, Uint NPages)
 796 {
 797         tVAddr  ret;
 798          int    i;
 799         tMM_PageInfo    pi;
 800
 801         ENTER("xPAddr iNPages", PAddr, NPages);
 802
 803         // Scan for a location
 804         for( ret = MM_HWMAP_BASE; ret < MM_HWMAP_END - NPages * PAGE_SIZE; ret += PAGE_SIZE )
 805         {
 806 //              LOG("checking %p", ret);
 807                 // Check if there is `NPages` free pages
 808                 for( i = 0; i < NPages; i ++ )
 809                 {
 810                         if( MM_int_GetPageInfo(ret + i*PAGE_SIZE, &pi) == 0 )
 811                                 break;
 812                 }
 813                 // Nope, jump to after the used page found and try again
 814 //              LOG("i = %i, ==? %i", i, NPages);
 815                 if( i != NPages ) {
 816                         ret += i * PAGE_SIZE;
 817                         continue ;
 818                 }
 819
 820                 // Map the pages
 821                 for( i = 0; i < NPages; i ++ )
 822                         MM_Map(ret+i*PAGE_SIZE, PAddr+i*PAGE_SIZE);
 823                 // and return
 824                 LEAVE('p', ret);
 825                 return ret;
 826         }
 827         Log_Warning("MMVirt", "MM_MapHWPages: No space for a %i page block", NPages);
 828         LEAVE('p', 0);
 829         return 0;
 830 }
 831
 832 tVAddr MM_AllocDMA(int Pages, int MaxBits, tPAddr *PAddr)
 833 {
 834         tPAddr  phys;
 835         tVAddr  ret;
 836
 837         phys = MM_AllocPhysRange(Pages, MaxBits);
 838         if(!phys) {
 839                 Log_Warning("MMVirt", "No space left for a %i page block (MM_AllocDMA)", Pages);
 840                 return 0;
 841         }
 842
 843         ret = MM_MapHWPages(phys, Pages);
 844         *PAddr = phys;
 845
 846         return ret;
 847 }
 848
 849 void MM_UnmapHWPages(tVAddr Vaddr, Uint Number)
 850 {
 851         Log_Error("MMVirt", "TODO: Implement MM_UnmapHWPages");
 852 }
 853
 854 tVAddr MM_NewKStack(int bShared)
 855 {
 856         tVAddr  min_addr, max_addr;
 857         tVAddr  addr, ofs;
 858
 859         if( bShared ) {
 860                 min_addr = MM_GLOBALSTACKS;
 861                 max_addr = MM_GLOBALSTACKS_END;
 862         }
 863         else {
 864                 min_addr = MM_KSTACK_BASE;
 865                 max_addr = MM_KSTACK_END;
 866         }
 867
 868         // Locate a free slot
 869         for( addr = min_addr; addr < max_addr; addr += MM_KSTACK_SIZE )
 870         {
 871                 tMM_PageInfo    pi;
 872                 if( MM_int_GetPageInfo(addr+MM_KSTACK_SIZE-PAGE_SIZE, &pi) )    break;
 873         }
 874
 875         // Check for an error
 876         if(addr >= max_addr) {
 877                 return 0;
 878         }
 879
 880         // 1 guard page
 881         for( ofs = PAGE_SIZE; ofs < MM_KSTACK_SIZE; ofs += PAGE_SIZE )
 882         {
 883                 if( MM_Allocate(addr + ofs) == 0 )
 884                 {
 885                         while(ofs)
 886                         {
 887                                 ofs -= PAGE_SIZE;
 888                                 MM_Deallocate(addr + ofs);
 889                         }
 890                         Log_Warning("MMVirt", "MM_NewKStack: Unable to allocate");
 891                         return 0;
 892                 }
 893         }
 894         return addr + ofs;
 895 }
 896
 897 tVAddr MM_NewUserStack(void)
 898 {
 899         tVAddr  addr, ofs;
 900
 901         addr = USER_STACK_TOP - USER_STACK_SIZE;
 902         if( MM_GetPhysAddr(addr + PAGE_SIZE) ) {
 903                 Log_Error("MMVirt", "Unable to create initial user stack, addr %p taken",
 904                         addr + PAGE_SIZE
 905                         );
 906                 return 0;
 907         }
 908
 909         // 1 guard page
 910         for( ofs = PAGE_SIZE; ofs < USER_STACK_SIZE; ofs += PAGE_SIZE )
 911         {
 912                 tPAddr  rv;
 913                 if(ofs >= USER_STACK_SIZE - USER_STACK_COMM)
 914                         rv = MM_Allocate(addr + ofs);
 915                 else
 916                         rv = MM_AllocateZero(addr + ofs);
 917                 if(rv == 0)
 918                 {
 919                         while(ofs)
 920                         {
 921                                 ofs -= PAGE_SIZE;
 922                                 MM_Deallocate(addr + ofs);
 923                         }
 924                         Log_Warning("MMVirt", "MM_NewUserStack: Unable to allocate");
 925                         return 0;
 926                 }
 927                 MM_SetFlags(addr+ofs, 0, MM_PFLAG_KERNEL);
 928         }
 929 //      Log("Return %p", addr + ofs);
 930 //      MM_DumpTables(0, 0x80000000);
 931         return addr + ofs;
 932 }
 933
 934 void MM_int_DumpTableEnt(tVAddr Start, size_t Len, tMM_PageInfo *Info)
 935 {
 936         if( giMM_ZeroPage && Info->PhysAddr == giMM_ZeroPage )
 937         {
 938                 Debug("%p => %8s - 0x%7x %i %x",
 939                         Start, "ZERO", Len,
 940                         Info->Domain, Info->AP
 941                         );
 942         }
 943         else
 944         {
 945                 Debug("%p => %8x - 0x%7x %i %x",
 946                         Start, Info->PhysAddr-Len, Len,
 947                         Info->Domain, Info->AP
 948                         );
 949         }
 950 }
 951
 952 void MM_DumpTables(tVAddr Start, tVAddr End)
 953 {
 954         tVAddr  range_start = 0, addr;
 955         tMM_PageInfo    pi, pi_old;
 956          int    i = 0, inRange=0;
 957
 958         pi_old.Size = 0;
 959         pi_old.AP = 0;
 960         pi_old.PhysAddr = 0;
 961
 962         Debug("Page Table Dump (%p to %p):", Start, End);
 963         range_start = Start;
 964         for( addr = Start; i == 0 || (addr && addr < End); i = 1 )
 965         {
 966                  int    rv;
 967 //              Log("addr = %p", addr);
 968                 rv = MM_int_GetPageInfo(addr, &pi);
 969                 if( rv
 970                  || pi.Size != pi_old.Size
 971                  || pi.Domain != pi_old.Domain
 972                  || pi.AP != pi_old.AP
 973                  || pi_old.PhysAddr != pi.PhysAddr )
 974                 {
 975                         if(inRange) {
 976                                 MM_int_DumpTableEnt(range_start, addr - range_start, &pi_old);
 977                         }
 978                         addr &= ~((1 << pi.Size)-1);
 979                         range_start = addr;
 980                 }
 981
 982                 pi_old = pi;
 983                 // Handle the zero page
 984                 if( !giMM_ZeroPage || pi_old.Size != 12 || pi_old.PhysAddr != giMM_ZeroPage )
 985                         pi_old.PhysAddr += 1 << pi_old.Size;
 986                 addr += 1 << pi_old.Size;
 987                 inRange = (rv == 0);
 988         }
 989         if(inRange)
 990                 MM_int_DumpTableEnt(range_start, addr - range_start, &pi);
 991         Debug("Done");
 992 }
 993
 994 // NOTE: Runs in abort context, not much difference, just a smaller stack
 995 void MM_PageFault(Uint32 PC, Uint32 Addr, Uint32 DFSR, int bPrefetch)
 996 {
 997          int    rv;
 998         tMM_PageInfo    pi;
 999
1000         rv = MM_int_GetPageInfo(Addr, &pi);
1001
1002         // Check for COW
1003         if( rv == 0 &&  pi.AP == AP_RO_BOTH )
1004         {
1005                 pi.AP = AP_RW_BOTH;
1006                 if( giMM_ZeroPage && pi.PhysAddr == giMM_ZeroPage )
1007                 {
1008                         tPAddr  newpage;
1009                         newpage = MM_AllocPhys();
1010                         if( !newpage ) {
1011                                 Log_Error("MMVirt", "Unable to allocate new page for COW of ZERO");
1012                                 for(;;);
1013                         }
1014
1015                         #if TRACE_COW
1016                         Log_Notice("MMVirt", "COW %p caused by %p, ZERO duped to %P (RefCnt(%i)--)", Addr, PC,
1017                                 newpage, MM_GetRefCount(pi.PhysAddr));
1018                         #endif
1019
1020                         MM_DerefPhys(pi.PhysAddr);
1021                         pi.PhysAddr = newpage;
1022                         pi.AP = AP_RW_BOTH;
1023                         MM_int_SetPageInfo(Addr, &pi);
1024
1025                         memset( (void*)(Addr & ~(PAGE_SIZE-1)), 0, PAGE_SIZE );
1026
1027                         return ;
1028                 }
1029                 else if( MM_GetRefCount(pi.PhysAddr) > 1 )
1030                 {
1031                         // Duplicate the page
1032                         tPAddr  newpage;
1033                         void    *dst, *src;
1034
1035                         newpage = MM_AllocPhys();
1036                         if(!newpage) {
1037                                 Log_Error("MMVirt", "Unable to allocate new page for COW");
1038                                 for(;;);
1039                         }
1040                         dst = (void*)MM_MapTemp(newpage);
1041                         src = (void*)(Addr & ~(PAGE_SIZE-1));
1042                         memcpy( dst, src, PAGE_SIZE );
1043                         MM_FreeTemp( (tVAddr)dst );
1044
1045                         #if TRACE_COW
1046                         Log_Notice("MMVirt", "COW %p caused by %p, %P duped to %P (RefCnt(%i)--)", Addr, PC,
1047                                 pi.PhysAddr, newpage, MM_GetRefCount(pi.PhysAddr));
1048                         #endif
1049
1050                         MM_DerefPhys(pi.PhysAddr);
1051                         pi.PhysAddr = newpage;
1052                 }
1053                 #if TRACE_COW
1054                 else {
1055                         Log_Notice("MMVirt", "COW %p caused by %p, took last reference to %P",
1056                                 Addr, PC, pi.PhysAddr);
1057                 }
1058                 #endif
1059                 // Unset COW
1060                 pi.AP = AP_RW_BOTH;
1061                 MM_int_SetPageInfo(Addr, &pi);
1062                 return ;
1063         }
1064
1065
1066         Log_Error("MMVirt", "Code at %p accessed %p (DFSR = 0x%x)%s", PC, Addr, DFSR,
1067                 (bPrefetch ? " - Prefetch" : "")
1068                 );
1069         if( Addr < 0x80000000 )
1070                 MM_DumpTables(0, 0x80000000);
1071         else
1072                 MM_DumpTables(0x80000000, -1);
1073         for(;;);
1074 }
1075